Among the biggest are actually some of those set to be free agents in 2020 after allowing their contracts to run down.
At the moment Tottenham could lose three of their top star in recent seasons with Christian Eriksen, Toby Alderweireld, and Jan Vertonghen all set to enter the final six months of their deals.
Eriksen and Alderweireld were heavily linked with moves last summer but neither saw one materialise with the Dane receiving no offers, despite his undeniable talents, while the latter saw a derisory bid come in from Roma.
Both players still have huge value so any club either landing them for a bargain fee in January or for free in July will be getting a superstar on the cheap,
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But who are the other most valuable footballers in the world – according to Transfermarkt – set to become free agents in 2020? Find out below…